[填空题]
A bungee jumper with mi*/fixps(qw;iof98n as9+hl5-mk f3eiao q.lzs 65.0 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times3 m-q5l kl9+he.aifz o in 38.0 s. He finally comes to rest 25.0 m below the level of the bridge. Calculate the spring stiffness constant and the unstretched length of the bungee cord.
spring stiffness constant$\approx$ N/m(Round to the nearest integer)
unstretched length of the bungee cord m